html,
body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  overflow: scroll;
}

#app {
  margin-top: 50px;
  width: 100vw;
  height: 100vh;
  overflow: scroll;
}

.lf-graph {
  overflow: scroll;
}

#back {
  position: fixed;
  z-index: 1000000000;
  bottom: 20px;
  right: 40px;
  width: 140px;
  height: 70px;
  line-height: 70px;
  text-align: center;
  font-size: 25px;
  border: 2px solid black;
  border-radius: 10px;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  -ms-border-radius: 10px;
  -o-border-radius: 10px;
}
